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Finding the Fourth Proportional to 128,644.60, 177,529.54 and 78,343.60

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Solution

The fourth proportional to 128,644.60, 177,529.54 and 78,343.60 is: 108,114.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,644.60 : 177,529.54 = 78,343.60 : x
  2. Step 2: Convert to fraction form
    128,644.60/177,529.54 = 78,343.60/x
  3. Step 3: Cross multiply
    128,644.60x = 177,529.54 × 78,343.60
  4. Step 4: Simplify right side
    128,644.60x = 13,908,302,382.30
  5. Step 5: Solve for x
    x = 13,908,302,382.30/128,644.60
  6. Step 6: Final answer
    x = 108,114.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.